US20070018593A1 - Balanced current lamp module and multi-lamp circuit - Google Patents

Balanced current lamp module and multi-lamp circuit Download PDF

Info

Publication number
US20070018593A1
US20070018593A1 US11/488,016 US48801606A US2007018593A1 US 20070018593 A1 US20070018593 A1 US 20070018593A1 US 48801606 A US48801606 A US 48801606A US 2007018593 A1 US2007018593 A1 US 2007018593A1
Authority
US
United States
Prior art keywords
lamp
transformer
balanced
coil
electrically connected
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
US11/488,016
Other versions
US7319297B2 (en
Inventor
Chun-Liang Kuo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Delta Electronics Inc
Original Assignee
Delta Electronics Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Delta Electronics Inc filed Critical Delta Electronics Inc
Assigned to DELTA ELECTRONICS, INC. reassignment DELTA ELECTRONICS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KUO, CHUN-LIANG
Publication of US20070018593A1 publication Critical patent/US20070018593A1/en
Application granted granted Critical
Publication of US7319297B2 publication Critical patent/US7319297B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14Circuit arrangements
    • H05B41/26Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/282Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices
    • H05B41/2821Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices by means of a single-switch converter or a parallel push-pull converter in the final stage
    • H05B41/2822Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices by means of a single-switch converter or a parallel push-pull converter in the final stage using specially adapted components in the load circuit, e.g. feed-back transformers, piezoelectric transformers; using specially adapted load circuit configurations

Definitions

  • the present invention relates to a lamp module and a multi-lamp circuit, and more particularly, to a balanced current lamp module and a multi-lamp circuit.
  • a cold cathode fluorescent lamp has a high luminance
  • the CCFL can serve as a light source and be applied to an electronic device, such as a liquid crystal display, to serve as a backlight source.
  • FIG. 1 is a schematic view showing a driving circuit for a conventional balanced current lamp circuit.
  • a power source 11 is electrically connected with a coil 121 of a transformer 12
  • two lamps 14 and 16 are respectively electrically connected with the other coil 122 of the transformer 12 through two capacitors 13 and 15 .
  • this connection method cannot ensure the working currents of the lamps 14 and 16 to be the same, and the luminance of the lamps 14 and 16 is thus different from each other.
  • FIG. 2 is a schematic view showing another driving circuit with an added balanced transformer.
  • a power source 21 is electrically connected with a coil 221 of a transformer 22 .
  • Two lamps 24 and 26 are respectively electrically connected with the other coil 222 of the transformer 22 through two capacitors 23 and 25 .
  • the lamps 24 and 26 are also electrically connected with two coils 271 and 272 of a balanced transformer 27 , such that the working currents of the lamps 24 and 26 are adjusted and unified through the balanced transformer 27 .
  • a feedback circuit 28 may also be connected with the coil 271 of the balanced transformer 27 so as to control the power source 21 in a feedback manner according to the working current of the lamp 24 and thus to adjust the working currents of the lamps 24 and 26 .
  • the present invention provides a balanced current lamp module and multi-lamp circuit, which can decrease the amount of the balanced transformers and ensure each lamp to have the same luminance.
  • the balanced current lamp module includes a first balanced current unit, a second balanced current unit and a balanced transformer.
  • the first balanced current unit includes a first transformer, a first lamp and a second lamp.
  • the first transformer has one coil electrically connected with the power source and the other coil having two ends respectively electrically connected with the first lamp and the second lamp.
  • the second balanced current unit includes a second transformer, a third lamp and a fourth lamp.
  • the second transformer has one coil electrically connected with the power source, and the other coil having two ends respectively electrically connected with the third lamp and the fourth lamp.
  • the balanced transformer has one coil electrically connected with the first lamp, and the other coil electrically connected with the fourth lamp.
  • a multi-lamp circuit is electrically connected with a power source.
  • the multi-lamp circuit includes a plurality of balanced current lamp modules.
  • Each balanced current lamp module includes a first transformer, a second transformer, a first lamp, a second lamp, a third lamp, a fourth lamp and a balanced transformer.
  • One coil of the first transformer and one coil of the second transformer are electrically connected with the power source.
  • Two ends of the other coil of the first transformer are respectively electrically connected with the first lamp and the second lamp.
  • Two ends of the other coil of the second transformer are respectively electrically connected with the third lamp and the fourth lamp.
  • One coil of the balanced transformer is electrically connected with the first lamp, and the other coil of the balanced transformer is electrically connected with the fourth lamp.
  • the multi-lamp circuit includes a plurality of balanced current lamp modules and a plurality of sub-stage balanced transformers.
  • Each balanced current lamp module includes a first transformer, a second transformer, a first lamp, a second lamp, a third lamp, a fourth lamp and a balanced transformer.
  • One coil of the first transformer and one coil of the second transformer are electrically connected with the power source.
  • Two ends of the other coil of the first transformer are respectively electrically connected with the first lamp and the second lamp.
  • Two ends of the other coil of the second transformer are respectively electrically connected with the third lamp and the fourth lamp.
  • the balanced transformer has one coil electrically connected with the first lamp, and the other coil electrically connected with the fourth lamp.
  • the sub-1-stage balanced transformer is electrically connected with two of the balanced current lamp modules, and the sub-N-stage balanced transformer is electrically connected with two of the sub-(N ⁇ 1)-stage balanced transformers.
  • a balanced current lamp module and a multi-lamp circuit can decrease the amount and cost of the balanced transformers, and ensure each lamp to have the same luminance.
  • FIG. 1 is a schematic view showing a conventional balanced current lamp circuit
  • FIG. 2 is a schematic view showing another conventional balanced current lamp circuit
  • FIG. 3 is a schematic view showing a balanced current lamp module according to a preferred embodiment of the present invention.
  • FIG. 4 is a schematic view showing a multi-lamp circuit according to a preferred embodiment of the present invention.
  • a balanced current lamp module 3 which is driven by a power source 4 , includes a balanced current unit 31 , a balanced current unit 32 and a balanced transformer 33 .
  • the balanced current unit 31 includes a transformer 311 , a lamp 312 and a lamp 313 .
  • the transformer 311 has one coil 311 A electrically connected with the power source 4 , and the other coil 311 B having two ends respectively electrically connected with the lamp 312 and the lamp 313 .
  • the balanced current unit 32 includes a transformer 321 , a lamp 322 and a lamp 323 .
  • the transformer 321 has one coil 321 A electrically connected with the power source 4 , and the other coil 321 B having two ends respectively electrically connected with the lamp 322 and the lamp 323 .
  • the balanced transformer 33 has one coil 331 electrically connected with the lamp 312 , and the other coil 332 electrically connected with the lamp 323 .
  • the coil 331 of the balanced transformer 33 is electrically connected with a feedback circuit 34 , and each of the lamps 312 , 313 , 322 and 323 may be a cold cathode fluorescent lamp.
  • the balanced current unit 31 further includes a capacitor 314 and a resistor 315 .
  • the capacitor 314 is connected in parallel with the coil 311 B of the transformer 311 and connected between the lamps 312 and 313 .
  • the resistor 315 is connected with the lamp 313 in series.
  • the resistor 315 may be a fixed resistor, a positive temperature thermistor or a negative temperature thermistor.
  • the balanced current unit 32 further includes a capacitor 324 and a resistor 325 .
  • the capacitor 324 is connected in parallel with the coil 321 B of the transformer 321 and connected between the lamps 322 and 323 .
  • the resistor 325 is connected with the lamp 323 in series.
  • the resistor 325 may be a fixed resistor, a positive temperature thermistor or a negative temperature thermistor.
  • the feedback circuit 34 which is electrically connected with the coil 331 of the balanced transformer 33 , controls the power source 4 in a feedback manner according to working currents of the lamps 312 and 313 , and thus adjusts the working currents of the lamps 312 , 313 , 322 and 323 .
  • one balanced transformer can balance the working currents of four lamps. Comparing with the prior art, the amount and cost of the balanced transformers of the present invention can be reduced, so each lamp can be ensured to have the same luminance.
  • a multi-lamp circuit 5 which is electrically connected with a power source 501 , includes a plurality of balanced current lamp modules 51 to 53 .
  • Each of the balanced current lamp modules 51 to 53 includes a plurality of balanced current units.
  • the balanced current lamp module 51 includes a balanced current unit 511 , a balanced current unit 512 and a balanced transformer 513 .
  • the balanced current unit 511 may include a transformer, two lamps, a capacitor and a resistor (not shown).
  • the balanced current units 511 , 512 , 521 , 522 , 531 and 532 and the balanced transformers 513 , 523 and 533 of FIG. 4 respectively have the same constructions and functions as those of the balanced current unit 31 , the balanced current unit 32 and the balanced transformer 33 of the embodiment shown in FIG. 3 . So, detailed descriptions thereof will be omitted.
  • the multi-lamp circuit 5 further includes a plurality of sub-stage balanced transformers 54 to 59 .
  • the sub-1-stage balanced transformer 54 is electrically connected with the balanced current lamp modules 51 and 52 .
  • the sub-1-stage balanced transformer 55 is electrically connected with two of the balanced current lamp modules.
  • the other sub-1-stage balanced transformers are electrically connected with two of the balanced current lamp modules.
  • the sub-2-stage balanced transformer 56 is electrically connected with the sub-1-stage balanced transformers 54 and 55 .
  • the other sub-2-stage balanced transformers are electrically connected with two of the sub-1-stage balanced transformers.
  • the connection method is made in the similar manner.
  • the sub-N-stage balanced transformer 59 is electrically connected with two of the sub-(N-1)-stage balanced transformers 57 and 58 , wherein N is a natural number. Consequently, when the multi-lamp is arranged, the working current of each lamp can be balanced and unified according to a plurality of stages of balanced transformers, such that the luminance of each lamp can be unified.
  • the sub-N-stage balanced transformer 59 may be electrically connected with a feedback circuit 502 , which can control the power source 501 in a feedback manner according to a current flowing through the sub-N-stage balanced transformer 59 so as to adjust the working currents of the lamps in the balanced current lamp modules 51 to 53 .
  • each balanced current unit due to one coil of the transformer of each balanced current unit is electrically connected between two lamps in series, and two coils of the balanced transformer are respectively electrically connected with one of the balanced current units, the working currents of the lamps within each balanced current unit are the same.
  • a balanced current lamp module and a multi-lamp circuit according to the present invention can decrease the amount and cost of the balanced transformers, and ensure each lamp to have the same luminance.

Abstract

A balanced current lamp module driven by a power source includes a first balanced current unit, a second balanced current unit and a balanced transformer. The first balanced current unit includes a first transformer, a first lamp and a second lamp. The first transformer has one coil electrically connected with the power source, and the other coil having two ends respectively electrically connected with the first lamp and the second lamp. The second balanced current unit includes a second transformer, a third lamp and a fourth lamp. The second transformer has one coil electrically connected with the power source, and the other coil having two ends respectively electrically connected with the third lamp and the fourth lamp. The balanced transformer has one coil electrically connected with the first lamp, and the other coil electrically connected with the fourth lamp.

Description

    BACKGROUND OF TH INVENTION
  • 1. Field of Invention
  • The present invention relates to a lamp module and a multi-lamp circuit, and more particularly, to a balanced current lamp module and a multi-lamp circuit.
  • 2. Related Art
  • Because a cold cathode fluorescent lamp (CCFL) has a high luminance, the CCFL can serve as a light source and be applied to an electronic device, such as a liquid crystal display, to serve as a backlight source.
  • FIG. 1 is a schematic view showing a driving circuit for a conventional balanced current lamp circuit. As shown in FIG. 1, a power source 11 is electrically connected with a coil 121 of a transformer 12, and two lamps 14 and 16 are respectively electrically connected with the other coil 122 of the transformer 12 through two capacitors 13 and 15. However, this connection method cannot ensure the working currents of the lamps 14 and 16 to be the same, and the luminance of the lamps 14 and 16 is thus different from each other.
  • Furthermore, FIG. 2 is a schematic view showing another driving circuit with an added balanced transformer. As shown in FIG. 2, a power source 21 is electrically connected with a coil 221 of a transformer 22. Two lamps 24 and 26 are respectively electrically connected with the other coil 222 of the transformer 22 through two capacitors 23 and 25. The lamps 24 and 26 are also electrically connected with two coils 271 and 272 of a balanced transformer 27, such that the working currents of the lamps 24 and 26 are adjusted and unified through the balanced transformer 27.
  • In addition, a feedback circuit 28 may also be connected with the coil 271 of the balanced transformer 27 so as to control the power source 21 in a feedback manner according to the working current of the lamp 24 and thus to adjust the working currents of the lamps 24 and 26.
  • Although this connection method can ensure the lamps 24 and 26 to have the same working current, the amount of balanced transformers has to be increased when the amount of lamps is increased because two lamps need one balanced transformer to ensure the working currents of the lamps to be the same. Thus, the cost is increased and the high cost is disadvantageous to the manufacture if the lamps are ensured to have the same luminance.
  • It is thus imperative to provide a balanced current lamp module and a multi-lamp circuit, which can control and unify the working currents of the lamps, such that the lamps can be held at the same luminance, and the amount and cost of the balanced transformers can be decreased.
  • SUMMARY OF THE INVENTION
  • In view of the foregoing, the present invention provides a balanced current lamp module and multi-lamp circuit, which can decrease the amount of the balanced transformers and ensure each lamp to have the same luminance.
  • To achieve the above, a balanced current lamp module according to the present invention is driven by a power source. The balanced current lamp module includes a first balanced current unit, a second balanced current unit and a balanced transformer. The first balanced current unit includes a first transformer, a first lamp and a second lamp. The first transformer has one coil electrically connected with the power source and the other coil having two ends respectively electrically connected with the first lamp and the second lamp. The second balanced current unit includes a second transformer, a third lamp and a fourth lamp. The second transformer has one coil electrically connected with the power source, and the other coil having two ends respectively electrically connected with the third lamp and the fourth lamp. The balanced transformer has one coil electrically connected with the first lamp, and the other coil electrically connected with the fourth lamp.
  • To achieve the above, a multi-lamp circuit according to the present invention is electrically connected with a power source. The multi-lamp circuit includes a plurality of balanced current lamp modules. Each balanced current lamp module includes a first transformer, a second transformer, a first lamp, a second lamp, a third lamp, a fourth lamp and a balanced transformer. One coil of the first transformer and one coil of the second transformer are electrically connected with the power source. Two ends of the other coil of the first transformer are respectively electrically connected with the first lamp and the second lamp. Two ends of the other coil of the second transformer are respectively electrically connected with the third lamp and the fourth lamp. One coil of the balanced transformer is electrically connected with the first lamp, and the other coil of the balanced transformer is electrically connected with the fourth lamp.
  • To achieve the above, another multi-lamp circuit according to the present invention is electrically connected with a power source. The multi-lamp circuit includes a plurality of balanced current lamp modules and a plurality of sub-stage balanced transformers. Each balanced current lamp module includes a first transformer, a second transformer, a first lamp, a second lamp, a third lamp, a fourth lamp and a balanced transformer. One coil of the first transformer and one coil of the second transformer are electrically connected with the power source. Two ends of the other coil of the first transformer are respectively electrically connected with the first lamp and the second lamp. Two ends of the other coil of the second transformer are respectively electrically connected with the third lamp and the fourth lamp. The balanced transformer has one coil electrically connected with the first lamp, and the other coil electrically connected with the fourth lamp. The sub-1-stage balanced transformer is electrically connected with two of the balanced current lamp modules, and the sub-N-stage balanced transformer is electrically connected with two of the sub-(N−1)-stage balanced transformers.
  • As mentioned above, due to two ends of the other coil of the first transformer are respectively electrically connected with the first lamp and the second lamp, two ends of the other coil of the second transformer are respectively electrically connected with the third lamp and the fourth lamp, one coil of the balanced transformer is electrically connected with the first lamp, and the other coil of the balanced transformer is electrically connected with the fourth lamp, the working currents of each lamp are the same. Comparing with the prior art, a balanced current lamp module and a multi-lamp circuit according to the present invention can decrease the amount and cost of the balanced transformers, and ensure each lamp to have the same luminance.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • The present invention will become more fully understood from the detailed description given herein below illustration only, and thus are not limitative of the present invention, and wherein:
  • FIG. 1 is a schematic view showing a conventional balanced current lamp circuit;
  • FIG. 2 is a schematic view showing another conventional balanced current lamp circuit;
  • FIG. 3 is a schematic view showing a balanced current lamp module according to a preferred embodiment of the present invention; and
  • FIG. 4 is a schematic view showing a multi-lamp circuit according to a preferred embodiment of the present invention.
  • DETAILED DESCRIPTION OF THE INVENTION
  • The present invention will be apparent from the following detailed description, which proceeds with reference to the accompanying drawings, wherein the same references relate to the same elements.
  • As shown in FIG. 3, a balanced current lamp module 3 according to a preferred embodiment of the present invention, which is driven by a power source 4, includes a balanced current unit 31, a balanced current unit 32 and a balanced transformer 33.
  • The balanced current unit 31 includes a transformer 311, a lamp 312 and a lamp 313. The transformer 311 has one coil 311A electrically connected with the power source 4, and the other coil 311B having two ends respectively electrically connected with the lamp 312 and the lamp 313.
  • The balanced current unit 32 includes a transformer 321, a lamp 322 and a lamp 323. The transformer 321 has one coil 321A electrically connected with the power source 4, and the other coil 321B having two ends respectively electrically connected with the lamp 322 and the lamp 323.
  • The balanced transformer 33 has one coil 331 electrically connected with the lamp 312, and the other coil 332 electrically connected with the lamp 323. In this embodiment, the coil 331 of the balanced transformer 33 is electrically connected with a feedback circuit 34, and each of the lamps 312, 313, 322 and 323 may be a cold cathode fluorescent lamp.
  • In addition, the balanced current unit 31 further includes a capacitor 314 and a resistor 315. The capacitor 314 is connected in parallel with the coil 311B of the transformer 311 and connected between the lamps 312 and 313. The resistor 315 is connected with the lamp 313 in series. The resistor 315 may be a fixed resistor, a positive temperature thermistor or a negative temperature thermistor.
  • The balanced current unit 32 further includes a capacitor 324 and a resistor 325. The capacitor 324 is connected in parallel with the coil 321B of the transformer 321 and connected between the lamps 322 and 323. The resistor 325 is connected with the lamp 323 in series. The resistor 325 may be a fixed resistor, a positive temperature thermistor or a negative temperature thermistor.
  • The feedback circuit 34, which is electrically connected with the coil 331 of the balanced transformer 33, controls the power source 4 in a feedback manner according to working currents of the lamps 312 and 313, and thus adjusts the working currents of the lamps 312, 313, 322 and 323.
  • In this embodiment, one balanced transformer can balance the working currents of four lamps. Comparing with the prior art, the amount and cost of the balanced transformers of the present invention can be reduced, so each lamp can be ensured to have the same luminance.
  • As shown in FIG. 4, a multi-lamp circuit 5 according to a preferred embodiment of the present invention, which is electrically connected with a power source 501, includes a plurality of balanced current lamp modules 51 to 53.
  • Each of the balanced current lamp modules 51 to 53 includes a plurality of balanced current units. For example, the balanced current lamp module 51 includes a balanced current unit 511, a balanced current unit 512 and a balanced transformer 513. For example, the balanced current unit 511 may include a transformer, two lamps, a capacitor and a resistor (not shown). The balanced current units 511, 512, 521, 522, 531 and 532 and the balanced transformers 513, 523 and 533 of FIG. 4 respectively have the same constructions and functions as those of the balanced current unit 31, the balanced current unit 32 and the balanced transformer 33 of the embodiment shown in FIG. 3. So, detailed descriptions thereof will be omitted.
  • In addition, the multi-lamp circuit 5 further includes a plurality of sub-stage balanced transformers 54 to 59. The sub-1-stage balanced transformer 54 is electrically connected with the balanced current lamp modules 51 and 52. The sub-1-stage balanced transformer 55 is electrically connected with two of the balanced current lamp modules. The other sub-1-stage balanced transformers are electrically connected with two of the balanced current lamp modules.
  • The sub-2-stage balanced transformer 56 is electrically connected with the sub-1-stage balanced transformers 54 and 55. The other sub-2-stage balanced transformers are electrically connected with two of the sub-1-stage balanced transformers. The connection method is made in the similar manner. Thus, the sub-N-stage balanced transformer 59 is electrically connected with two of the sub-(N-1)-stage balanced transformers 57 and 58, wherein N is a natural number. Consequently, when the multi-lamp is arranged, the working current of each lamp can be balanced and unified according to a plurality of stages of balanced transformers, such that the luminance of each lamp can be unified.
  • In addition, the sub-N-stage balanced transformer 59 may be electrically connected with a feedback circuit 502, which can control the power source 501 in a feedback manner according to a current flowing through the sub-N-stage balanced transformer 59 so as to adjust the working currents of the lamps in the balanced current lamp modules 51 to 53.
  • In summary, due to one coil of the transformer of each balanced current unit is electrically connected between two lamps in series, and two coils of the balanced transformer are respectively electrically connected with one of the balanced current units, the working currents of the lamps within each balanced current unit are the same. Comparing with the prior art, a balanced current lamp module and a multi-lamp circuit according to the present invention can decrease the amount and cost of the balanced transformers, and ensure each lamp to have the same luminance.
  • Although the present invention has been described with reference to specific embodiments, this description is not meant to be construed in a limiting sense. Various modifications of the disclosed embodiments, as well as alternative embodiments, will be apparent to persons skilled in the art. It is, therefore, contemplated that the appended claims will cover all modifications that fall within the true scope of the present invention.

Claims (20)

1. A balanced current lamp module driven by a power source, the lamp module comprising:
a first balanced current unit comprising a first transformer, a first lamp and a second lamp, wherein the first transformer has one coil electrically connected with the power source and the other coil having two ends respectively electrically connected with the first lamp and the second lamp;
a second balanced current unit comprising a second transformer, a third lamp and a fourth lamp, wherein the second transformer has one coil electrically connected with the power source, and the other coil having two ends respectively electrically connected with the third lamp and the fourth lamp; and
a balanced transformer having one coil electrically connected with the first lamp, and the other coil electrically connected with the fourth lamp.
2. The balanced current lamp module according to claim 1, wherein the first lamp, the second lamp, the third lamp or the fourth lamp is a cold cathode fluorescent lamp.
3. The balanced current lamp module according to claim 1, wherein the first balanced current unit further comprises a first capacitor, which is connected in parallel with the other coil of the first transformer and connected between the first lamp and the second lamp.
4. The balanced current lamp module according to claim 1, wherein the second balanced current unit further comprises a second capacitor, which is connected in parallel with the other coil of the second transformer and connected between the third lamp and the fourth lamp.
5. The balanced current lamp module according to claim 1, wherein the second lamp or the fourth lamp is connected with a resistor in series.
6. The balanced current lamp module according to claim 5, wherein the resistor is a fixed resistor, a positive temperature thermistor or a negative temperature thermistor.
7. The balanced current lamp module according to claim 1, wherein the one coil of the balanced transformer is electrically connected with a feedback control module.
8. A multi-lamp circuit electrically connected with a power source, comprising:
a plurality of balanced current lamp modules, each of which comprises a first transformer, a second transformer, a first lamp, a second lamp, a third lamp, a fourth lamp and a balanced transformer, wherein one coil of the first transformer and one coil of the second transformer are electrically connected with the power source, two ends of the other coil of the first transformer are respectively electrically connected with the first lamp and the second lamp, two ends of the other coil of the second transformer are respectively electrically connected with the third lamp and the fourth lamp, one coil of the balanced transformer is electrically connected with the first lamp, and the other coil of the balanced transformer is electrically connected with the fourth lamp.
9. The multi-lamp circuit according to claim 8, wherein the first lamp, the second lamp, the third lamp or the fourth lamp is a cold cathode fluorescent lamp.
10. The multi-lamp circuit according to claim 8, wherein the balanced current lamp unit further comprises a first capacitor and a second capacitor, the first capacitor is connected in parallel with the other coil of the first transformer and connected between the first lamp and the second lamp, and the second capacitor is connected in parallel with the other coil of the second transformer and connected between the third lamp and the fourth lamp.
11. The multi-lamp circuit according to claim 8, wherein the second lamp or the fourth lamp is connected with a resistor in series.
12. The multi-lamp circuit according to claim 11, wherein the resistor is a fixed resistor, a positive temperature thermistor or a negative temperature thermistor.
13. The multi-lamp circuit according to claim 8, further comprising:
at least one sub-1-stage balanced transformer having two coils respectively electrically connected with two of the balanced current lamp modules.
14. The multi-lamp circuit according to claim 13, wherein one coil of the sub-1-stage balanced transformer is electrically connected with a feedback control module.
15. The multi-lamp circuit according to claim 13, further comprising:
at least one sub-N-stage balanced transformer having two coils respectively electrically connected with two of the sub-(N−1)-stage balanced transformers.
16. The multi-lamp circuit according to claim 15, wherein one coil of the sub-N-stage balanced transformer is electrically connected with a feedback control module.
17. A multi-lamp circuit electrically connected with a power source, comprising:
a plurality of balanced current lamp modules, each of which comprises a first transformer, a second transformer, a first lamp, a second lamp, a third lamp, a fourth lamp and a balanced transformer, wherein one coil of the first transformer and one coil of the second transformer are electrically connected with the power source, two ends of the other coil of the first transformer are respectively electrically connected with the first lamp and the second lamp, two ends of the other coil of the second transformer are respectively electrically connected with the third lamp and the fourth lamp, one coil of the balanced transformer is electrically connected with the first lamp, and the other coil of the balanced transformer is electrically connected with the fourth lamp; and
a plurality of sub-stage balanced transformers, the sub-1-stage balanced transformer is electrically connected with two of the balanced current lamp modules, wherein the sub-N-stage balanced transformer is electrically connected with two of the sub-(N−1)-stage balanced transformers.
18. The multi-lamp circuit according to claim 17, wherein the first lamp, the second lamp, the third lamp or the fourth lamp is a cold cathode fluorescent lamp.
19. The multi-lamp circuit according to claim 17, wherein the balanced current lamp unit further comprises a first capacitor and a second capacitor, the first capacitor is connected in parallel with the other coil of the first transformer and connected between the first lamp and the second lamp, and the second capacitor is connected in parallel with the other coil of the second transformer and connected between the third lamp and the fourth lamp.
20. The multi-lamp circuit according to claim 17, wherein one coil of the sub-N-stage balanced transformer is electrically connected with a feedback control module.
US11/488,016 2005-07-22 2006-07-18 Balanced current lamp module and multi-lamp circuit Expired - Fee Related US7319297B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TW094124963A TW200705502A (en) 2005-07-22 2005-07-22 Balanced current lamp module and multi-lamp circuit
TW094124963 2005-07-22

Publications (2)

Publication Number Publication Date
US20070018593A1 true US20070018593A1 (en) 2007-01-25
US7319297B2 US7319297B2 (en) 2008-01-15

Family

ID=37678447

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/488,016 Expired - Fee Related US7319297B2 (en) 2005-07-22 2006-07-18 Balanced current lamp module and multi-lamp circuit

Country Status (2)

Country Link
US (1) US7319297B2 (en)
TW (1) TW200705502A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060284568A1 (en) * 2005-06-17 2006-12-21 Hon Hai Precision Industry Co., Ltd. Power supply system for flat panel display devices
US20070159117A1 (en) * 2006-01-06 2007-07-12 Chuntex Electronic Co., Ltd. Backlight module control circuit of multi-lamp display device
US11189236B2 (en) * 2017-04-04 2021-11-30 Samsung Electronics Co., Ltd. Power stabilization circuit which cancels noise of relay and display device to which same is applied

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101080128B (en) * 2006-05-26 2012-10-03 昂宝电子(上海)有限公司 Cycle framework driving system and method of multi-tube CCFL and/or EEFL
US8054001B2 (en) * 2006-09-18 2011-11-08 O2Micro Inc Circuit structure for LCD backlight
US20080116823A1 (en) * 2006-11-22 2008-05-22 Chun-Kong Chan Current-balancing apparatus for lamps
CN101409972B (en) * 2007-10-12 2016-10-05 昂宝电子(上海)有限公司 For multiple cold cathode fluorescence lamps and/or the drive system of external-electrode fluorescent lamp and method
CN102006705A (en) * 2009-08-31 2011-04-06 群康科技(深圳)有限公司 Lamp tube driving circuit
US8198829B2 (en) * 2009-12-09 2012-06-12 Leviton Manufacturing Co., Inc. Intensity balance for multiple lamps

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4574222A (en) * 1983-12-27 1986-03-04 General Electric Company Ballast circuit for multiple parallel negative impedance loads
US6310444B1 (en) * 2000-08-10 2001-10-30 Philips Electronics North America Corporation Multiple lamp LCD backlight driver with coupled magnetic components
US6534934B1 (en) * 2001-03-07 2003-03-18 Ambit Microsystems Corp. Multi-lamp driving system
US6717372B2 (en) * 2001-06-29 2004-04-06 Ambit Microsystems Corp. Multi-lamp driving system
US6936975B2 (en) * 2003-04-15 2005-08-30 02Micro International Limited Power supply for an LCD panel
US7061183B1 (en) * 2005-03-31 2006-06-13 Microsemi Corporation Zigzag topology for balancing current among paralleled gas discharge lamps
US7166969B2 (en) * 2003-11-10 2007-01-23 Kazuo Kohno Drive circuit for illumination unit

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4574222A (en) * 1983-12-27 1986-03-04 General Electric Company Ballast circuit for multiple parallel negative impedance loads
US6310444B1 (en) * 2000-08-10 2001-10-30 Philips Electronics North America Corporation Multiple lamp LCD backlight driver with coupled magnetic components
US6534934B1 (en) * 2001-03-07 2003-03-18 Ambit Microsystems Corp. Multi-lamp driving system
US6717372B2 (en) * 2001-06-29 2004-04-06 Ambit Microsystems Corp. Multi-lamp driving system
US6936975B2 (en) * 2003-04-15 2005-08-30 02Micro International Limited Power supply for an LCD panel
US7166969B2 (en) * 2003-11-10 2007-01-23 Kazuo Kohno Drive circuit for illumination unit
US7061183B1 (en) * 2005-03-31 2006-06-13 Microsemi Corporation Zigzag topology for balancing current among paralleled gas discharge lamps

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060284568A1 (en) * 2005-06-17 2006-12-21 Hon Hai Precision Industry Co., Ltd. Power supply system for flat panel display devices
US7291987B2 (en) * 2005-06-17 2007-11-06 Hon Hai Precision Industry Co., Ltd. Power supply system for flat panel display devices
US20070159117A1 (en) * 2006-01-06 2007-07-12 Chuntex Electronic Co., Ltd. Backlight module control circuit of multi-lamp display device
US7285925B2 (en) * 2006-01-06 2007-10-23 Chuntex Electronic Co., Ltd. Backlight module control circuit of multi-lamp display device
US11189236B2 (en) * 2017-04-04 2021-11-30 Samsung Electronics Co., Ltd. Power stabilization circuit which cancels noise of relay and display device to which same is applied

Also Published As

Publication number Publication date
TW200705502A (en) 2007-02-01
US7319297B2 (en) 2008-01-15

Similar Documents

Publication Publication Date Title
US7319297B2 (en) Balanced current lamp module and multi-lamp circuit
US6717372B2 (en) Multi-lamp driving system
KR101233819B1 (en) Apparatus for driving lamp and liquid crystal display having the same
US7525258B2 (en) Current balancing techniques for fluorescent lamps
JP4686434B2 (en) Active current adjustment circuit and light emitting structure thereof
EP1833283A1 (en) Multuple-light discharge lamp lighting device
KR101012800B1 (en) Driving device of light source for display device
KR20070093761A (en) Driver circuit for light emitting diodes back-light
US8120262B2 (en) Driving circuit for multi-lamps
US20080129222A1 (en) Multi-lamp driving system and current balance circuit thereof
CN102013234A (en) Equipment for adjusting backlight brightness based on temperature detection in liquid crystal panel
US7564191B2 (en) Inverter having single switching device
US7764024B2 (en) Piezoelectric transformer module for generating balance resonance driving current and related light module
US7994738B2 (en) Display driving circuit
KR100671453B1 (en) Back light Inverter for drive of multi Cold-cathode tub Fluorescent lamp
KR101364585B1 (en) Current balancing circuit for driving multi-lamp
US20100289422A1 (en) Piezoelectric type resonance high-voltage light-starting circuit
US7586269B2 (en) Device for driving light source module
KR101692458B1 (en) Backlight unit and display apparatus having the same
US20070285020A1 (en) Current balance circuit
US20100237795A1 (en) Multiple lamp driving device comprising balance transformer
US7429831B2 (en) Balance controlling circuit
KR101254571B1 (en) Current balancing circuit for driving multi-lamp
KR101357144B1 (en) Current balancing circuit for driving multi-lamp
KR100965821B1 (en) Power Supply And Liquid Crystal Display Using The Same

Legal Events

Date Code Title Description
AS Assignment

Owner name: DELTA ELECTRONICS, INC., TAIWAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KUO, CHUN-LIANG;REEL/FRAME:018071/0269

Effective date: 20060330

FPAY Fee payment

Year of fee payment: 4

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362

FP Lapsed due to failure to pay maintenance fee

Effective date: 20160115